net.peanuuutz.fork.ui.foundation.draw.Background.kt Maven / Gradle / Ivy

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/*
 * Copyright 2020 The Android Open Source Project
 * Modifications Copyright 2022 Peanuuutz
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.peanuuutz.fork.ui.foundation.draw

import androidx.compose.runtime.Stable
import net.peanuuutz.fork.ui.foundation.draw.painter.BrushPainter
import net.peanuuutz.fork.ui.foundation.draw.painter.ColorPainter
import net.peanuuutz.fork.ui.foundation.draw.painter.TexturePainter
import net.peanuuutz.fork.ui.inspection.InspectInfo
import net.peanuuutz.fork.ui.ui.draw.ContentDrawScope
import net.peanuuutz.fork.ui.ui.draw.Painter
import net.peanuuutz.fork.ui.ui.draw.ScaleFactor
import net.peanuuutz.fork.ui.ui.draw.shading.Brush
import net.peanuuutz.fork.ui.ui.draw.shading.TextureRegion
import net.peanuuutz.fork.ui.ui.draw.shading.TextureSpec
import net.peanuuutz.fork.ui.ui.draw.shading.createFullRegion
import net.peanuuutz.fork.ui.ui.modifier.Modifier
import net.peanuuutz.fork.ui.ui.modifier.ModifierNodeElement
import net.peanuuutz.fork.ui.ui.node.DrawModifierNode
import net.peanuuutz.fork.ui.ui.node.ModifierNode
import net.peanuuutz.fork.util.common.Color

@Stable
fun Modifier.background(
    color: Color,
    alpha: Float = 1.0f
): Modifier {
    val painter = ColorPainter(
        color = color,
        alpha = alpha
    )
    return background(painter)
}

@Stable
fun Modifier.background(
    brush: Brush,
    alpha: Float = 1.0f
): Modifier {
    val painter = BrushPainter(
        brush = brush,
        alpha = alpha
    )
    return background(painter)
}

@Stable
fun Modifier.background(
    spec: TextureSpec,
    region: TextureRegion = spec.createFullRegion(),
    scaleFactor: ScaleFactor = ScaleFactor.Unchanged,
    tintColor: Color = Color.White,
    alpha: Float = 1.0f
): Modifier {
    val painter = TexturePainter(
        spec = spec,
        region = region,
        scaleFactor = scaleFactor,
        tintColor = tintColor,
        alpha = alpha
    )
    return background(painter)
}

@Stable
fun Modifier.background(painter: Painter): Modifier {
    return this then BackgroundModifier(painter)
}

// ======== Internal ========

private data class BackgroundModifier(
    val painter: Painter
) : ModifierNodeElement() {
    override fun create(): BackgroundModifierNode {
        return BackgroundModifierNode(painter)
    }

    override fun update(node: BackgroundModifierNode) {
        node.painter = painter
    }

    override fun InspectInfo.inspect() {
        set("painter", painter)
    }
}

private class BackgroundModifierNode(
    var painter: Painter
) : ModifierNode(), DrawModifierNode {
    override fun ContentDrawScope.draw() {
        with(painter) {
            onDraw()
        }
        drawContent()
    }
}